Charles j



(No Model.)

0. J. HARTLEY.

ELECTRIC ARC LAMP.

No. 512,880. Patented Jan. 16,1894.

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% Z bgfiszigorncy UNITED STATES PATENT OFFICEv CHARLES J. HARTLEY, OFDECATUR, ILLINOIS, ASSIGN OR OF TW O-TI'IIRDS TO JOHN K. \VARREN ANDBRADFORD K. DURFEE, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 512,880, dated January16, 1894.

Application filed March 31,1893.

To all whom it may concern:

Be it known that 1, CHARLES J. HARTLEY, of Decatur, in the county ofMacon and State of Illinois, have invented certain new and use- 5 fulImprovements in Arc Lamps, of which the following is a specification.

This invention is designed to improve the clutch mechanism of arc lamps,and to provide means for increasing or diminishing the 10 elfect of thederived circuit on the carboncarrying core. It is embodied in thedetails of construction and combination ofv parts hereinafter set forthand claimed.

In the drawings forming part of this speci- I 5 fication, Figure 1 is anelevation of so much of a lamp as is needed to illustrate myinvention,parts being broken away to expose essential features. Fig. 2is a section vertically through the center of the spool of the derivedcircuit, showing novel features and omitting all else. Fig. 3 is a sideelevation of the clutch and adjuncts as they appear while releasing thecarbon rod. Fig. a is a plan of the clutch.

1 is the carbon rod.

2 is the spool of the derived circuit wire.

at is the carbon-carrying core on which the clutch is mounted.

5 is an adjustable core held in the lower end 0 of the spool by means ofa set screw, '7, ex-

tending through flange 6 of spool support 8. Plate 11 is adjustablysupported by set screws 13 which extend through permanent plate12, tube 9 extends upward from plate 11, and

5 spring encircles the tube and supports the core & yieldingly from theadjustable plate. Cap 14. is fitted on the upper end of the spool, andit protects the incased clutch mechanism. Plate 16, on the upper end ofthe core a has the upwardly extending semi-cylindrical hearing 17,conforming, in its inner surface, to the size and shape of the carbonrod; and it also has the bearing 19 on the opposite side of the carbonrod, the inner surface of which inclines 4 5 upward and away from thecarbon rod. Roller 18 lies between bearing 19 and carbon rod 1, and itis preferably grooved peripherally to conform to the shape of the carbonrod. It

projects laterally beyond the sides of plate 16, and its diameter issuch that it will press .The clutch is simple, sensitive and secure,

Serial No. 168,472- Nc model.)

closely against the carbon rod when at the bottom of the incline. Thestuds 15, on the upper end of the spool, are adapted to engage the endsof the roller, when the core is drawn downward by the derived circuit incoil 3, and such. engagement causes the release of the carbon rod byraising the roller from its wedged position. The plate 20, on the upperend of hearing 19 holds the rollerin operative position and also limitsits upward motion and so increases its sensitiveness, or quickness ofaction. The adjustable core 5 becomes magnetized by the current of thederived circuit and tends to attract the movable core with a forceinversely proportionate to the distance between the two. So when it isdesired to increase the strength of the magnet the adjustable core ismoved upward, or toward the moving core, and properly secured, and areverse operation is performed to effect acontrary result. In making theadjustments it is necessary to avoid bringing the cores in actualcontact. The use of the adjustable core enables the same lamp to be usedunder diiferent circumstances and with diderent currents, and when thecircumstances are determined and the core properly adjusted, no furtherattention is required until the circumstances change.

and the only essentials of its construction are that the inner surfaceof bearing 19 shall incline slightly backward and upward from a verticalline, that the diameter of the roller shall be sufficient to extend fromthe lower part of the bearing surface of the incline to the carbon rod,and that provision shall be made for raising the roller as the core 1 isdrawn downward by the derived circuit.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A clutch for the carbon rods of electric lamps,comprising an electrically controlled plate encompassing the rod, abearing on the plate extending upward and inclining slightly away fromthe rod, a roller between the rod and the inclined bearing, andpermanent stops adapted to raise the roller as the plate descends.

2. In clutches for electric lamps, the combination of a derived circuitspool, a core therefor, a carbon rod extending through the core, aplate, or head, on the core, a bearing on the plate extending upward andinclining slightly. away from the rod, a roller between the rod and theinclined bearing, and stops on the spool adapted to raise the roller asthe core descends, substantially as set forth.-

3. In clutches for electric lamps, the combination of the spool for thederived circuit, the core controlled thereby, the plate 16 on the core,the semi-cylindrical bearing 17 and the inclined bearing 19 extendingupward from the plate, the rod extending through bearing 17,,the roller18 between bearing 19 and the rod, the plate 20 to retain the roller inoperative position, and the studs 15, on the upper head of the spool,adapted to engage the ends of the roller, substantially as and for thepurpose set forth.

4. An adjustable core in a derived circuit spool or magnet adapted toact attractively on a movable or clutch carrying core.

5. In arc lamps, thecombination of a solenoid on a non-magnetic spool, aclutch-carrying core controlled by the solenoid, a carbon rod extendedthrough the clutch-carrying core and the spool, and a tubular coreencircling the carbon rod and adjustable in the spool at varyingdistances from the clutch carrying core substantially as set forth.

6. In are lamps, the combination of spool 2 having the derived circuitwire 3, the clutchcarrying core 4 controlled by and movable in the upperend of the spool, and. the core 5 j

